Automatic tool for boring.



J. A. LBL/TND a; W. G. STEBBINS. AUTOMATIC TOOL POR BORING.

AYLIGATION FIL BD DEG.22,1908.

.Patented Dec. 7, 1909.

ANDREW. s GRAHAM co., FNovc-Lmosmwans. waswrmw, u, c.

TE ST JOHN A. LELAND AND WILLIAM G. STEBBINS, 0F MONTAGUE, MASSACHUSETTS, AS- SIGNORS TO MILLERS FALLS COMPANY, OF MILLER-S FALLS, MASSACHUSETTS, A

CORPORATION OF MASSACHUSETTS.

AUTOMATIC TOOL FOR BORING.

To all whom t may cof/wem:

Be it known that we, JOHN A. LELAND and VILLIAM G. STEBBINS, both of Montague, in the county of Franklin and State of Massachusetts, have invented certain new and useful Improvements in Automatic Tools for Boring, &c., of which the following is a specification.

This invention relates to boring and other tools in which the chuck which carries the operating bit is automatically rotated by the endwise movement of the shank into a tubular holder, the holder and shank being provided with inter-engaging members, such as a screw-threaded stem attached to the holder-and a nut attached to the shank and engaging said holder, whereby an endwise movement of the shank relatively to the holder is caused at the same time to rota-te the shank and the bit-carrying chuck attached thereto.

The invention has for its object, first, to provide a tool of this character in which the shank is adapted to be locked to the holder against endwise movement, vwhereby first, the holder and shank may be rotated together as a hand or non-automatic tool, and secondly, the tool as a whole may be reduced to compact form by forcing the shank into the holder and locking it therein. against the projecting pressure of the usual spring which is provided to normally project the shank from the holder.

The invention also has for its object to provide in a tool of this character an improved magazine for holding a plurality of bits, and permitting the convenient selection of any bit that may be desired for use. lVe use the term bit in this connection to indicate the acting instrument which is held and rotated by the shank, it being understood that said instrument may be a boring bit or drill, a screw-driver, or any other instrument which is capable of being used with a tool of this character.

The invention consists in the improvements which we will now proceed to describe and cla-im.

Of the accompanying drawings, forming a part of this specicatio1i,-Figure 1 represents a side elevation of a tool embodying our invention. Fig. 2 represents an eleva- Speccaton of Letters Patent.

Application filed December 22, 1908.

Patented Dec. *7, 1909.

Serial No. 468,774.

tion of the outer end of the holder. Fig. 3 represents a section on line 3 3 of Fig. 1. Fig. 4 represents a section on line 4 4 of Fig. 3. Fig. 5 represents a view showing the tool in a collapsed or contracted condition, portions of the holder and shank being shown in section. Fig. 6 represents an enlargement of a portion of Fig. 3. Fig. 7 represents a view similar to Fig. 6, showing a different adjustment. Fig. 8 represents a sectional view of the adjustable abutment and the spring clamping ring therein, hereinafter referred to. Fig. 9 represents a section on line 9-9 of Fig. 3. Fig. 10 represents a view similar to a portion of Fig. 3, showing the magazine locking bolt retracted. Fig. 11 represents a view similar to Fig. 10, showing the magazine adjusted to receive or deliver a bit.

The same reference characters indicate the same parts in all the figures.

12 represents a cylindrical shank which is provided at its outer end with a chuck 13 adapted to detachably engage an operating bit 14. Said shank is movable endwise into and out of a holder which, as here shown, includes a tubular inner member 15, and a tubular outer member 1G, the main portion of which is separated from the main portion of the inner member by an annular space which is subdivided, as hereinafter described, to form a magazine adapted to contain a plurality of operating bits 14 of different kinds, the outer member 16 having a contracted portion 17 at the inner end of the holder, which portion bears upon the inner end portion of the inner member 15, as shown in Figs. 3 and 5, the two members being rigidly secured to each other in any suitable way.

18 represents a tubular stem which is attached to a head piece 19 aflixed to the outer end portion of the inner member 15, said stem having external screw threads 20 of abrupt pitch. To the interior of the shank 12 is affixed a nut 21 engaging the threads 18, so that an endwise movement of the shank relatively to the holder will cause a rotation of the shank.

22 represents a shank-projecting spring seated at one end on an abutment at the outer end of the tubular stem 18, and at its other end on an abutment in the chuck 13, the spring being adapted to normally pro.- ject the shank from the holder, as indicated in Fig. 3.

When the operating bit is pressed against the work on which it acts, and the holder is moved relatively to the shank 12, so that the latter enters the shank, the engagement of the nut 21 and the screw-threaded stem 18 causes a rotation of the shank in one direction. When pressure on the holder is removed, the spring 21 acts to project the shank, the nut and screw-threaded stem at the same time acting to rotate the shank in the opposite direction.

Our invention includes means for locking the shank to the holder, so that the tool, as a whole, may be held in a contracted condition, as shown in Fig. 5, or the shank when projected to any extent desired, may be locked to the holder, so that the holder and shank may be manipulated as one part and operated as a non-automatic tool, the reciprocal action of the nut and the screwthreaded stem being prevented.

The preferred means for locking the shank to the holder comprise a resilient wire clamping ring 23 which is divided at one point, and is adapted to embrace the shank 12, the resilience of the ring being such that it normally expands out of engagement with the shank, and two abutments 24 and 25 carried by the holder, the ring being interposed between said abutments. The abutment 24 is fixed relatively to the holder, and

is formed by the end of the contracted por-' tion 17 of the outer member of the holder, while the abutment 25 is adjustably mounted on the holder, and is formed on an internally threaded sleeve 26 which is engaged with an external thread formed on the contracted portion 17. Then the sleeve 26 is turned to the position shown in Figs. 3 and 6, the clamping ring 23 is loosely coniined between the abutments, and is free to expand so that it does not bind upon the shank 12. Vhen it is desired to lock the shank to the holder, the sleeve 26 is turned inwardly to the position shown in Figs. 5 and 7, this operation causing the two abutments to coperate in compressing the clamping ring 23, and forcing it into binding engagement with the shank 12 with su'Hicient firmness to prevent endwise movement of the shank.

It will be seen from the foregoing that when it is desired to lock the shank to the holder, the clamping rino` 23 is contracted on the holder by an inward adjustment of the abutment 25. This may be accomplished when the shank is in any position which it is capable of assuming, that is, either fully retracted, as shown in Fig. 5, or fully or partially projected. Provision is therefore made for maintaining the tool in compact forni for storage, and for enabling the shankto be rotated by the rotation of the holder, the latter serving as a handle.

27 represents a rod which is engaged with the chuck 13, and supports the portion of the spring 22 which projects from the tubular stem 18, the rod preventing the spring from buckling.

As before stated, the main portions of the members 15 and 16 of the holder are separated by an annular space, this space being subdivided to form a series of bit-containing pockets, so that the holder constitutes a magazine adapted to contain a numberl of bits. The subdivision of the annular space is preferably effected by means of a longitudinally corrugated sheet metal sleeve 28 (Fig. 9) inserted in the annular space, the spaces between the corrugations being of sufficient width to form pockets 30 extending lengthwise of the holder, each pocket being adapted to contain a bit.

31 represents a cap which is connected by a pivot screw 32 with the head piece 19 of the holder. Said cap has an vorifice 33 adapted to coincide with either of the pockets 30, said orifice being of suicient size to constitute a mouth for the pocket with which it coincides, thus enabling a bit to be inserted or removed from said pocket, as illustrated in Fig. 11. Said orifice is also adapted to engage a locking bolt 34 which is normally projected by a spring 35, said bolt and spring being preferably located in one of the pockets 30. `When the orifice 33 is in position to coincide with the pocket containing the bolt 34, the cap closes all the other pockets, and is locked by the engagement of the bolt 34 with the orifice. The bolt is provided with a stud 36 which projects through a slot 37 in the outer member of the holder, and enables the bolt to be retracted to release the cap.

The external surface of the holder is preferably provided with indicating marks 38 which are preferably numerals, as shown in Fig. 1, said marks coinciding with the different pockets. The bits inserted in the several pockets may be designated by marks similar to the marks 38 on the exterior of the holder, so that the operator is enabled to conveniently select any bit that may be desired. In Figs. 3 and 5, the bolt is shown as projected to lock the cap 31, and in Fig. 10, the bolt is shown retractedV to release the cap.

The chuck portion referred to comprises a body portion 13 having a socket 40 for the reception of the shank of the bit 14, and having in one side a recess in which is pivoted at 41 a jaw 42 adapted to engage a notch 43 in the bit shank. The body 13 is externally screw-threaded, Vand with it is engaged an internally threaded sleeve 44, one end of which is contracted to form a tapered internal face 45 which is adapted when the I prising a tubular holder, a tool carrying` sleeve is adjusted inwardly on the body of the chuck, to engage the outer end of the jaw 42, and force the same inwardly into engagement with the notch in the bit shank.

46 represents a spring which is connected with the body 13 and with the aw 42, and normally swings the outer end of the jaw outwardly so that when the sleeve 44 is adjusted outwardly, the jaw automatically releases the bit and permits the latter to be withdrawn.

The jaw 42 by its projection into a notch in the bit shank, positively engages the latter when the bit is being withdrawn from the hole it has formed, separation of the jaw from the bit shank during the Withdrawing movement being impossible.

We claim:

l. A tool of the character described, comprising a tubular holder, a tool carrying` shank movable endwise in the holder, said holder and shank having` interengaged members which cause the rotation of the shank when it is moved endwise, a spring which normally projects the shank from the holder', and means for locking` the shank at any point in its range of projection to prevent rotation and endwise movement thereof.

2. A tool of the character described, comshank movable endwise in the holder, said holder and shank having interengaged members which cause the rotation of the shank when it is moved endwise, a spring which normally projects the shank from the holder, and a shank locking device carried by the holder and constructed to engage the shank at any point in its range of projection to prevent rotation and endwise movement 40 thereof.

3. A tool of the character described, comprising a tubular holder, a tool carrying shank movable endwise in the holder, said holder and shank having interengaged members which cause the rotation of the shank when it -is moved endwise, a spring which normally projects the shank from the holder, a clamp constructed to engage said shank at any point in its range of projection 

